Patent attributes
The present invention is to provide a GePD, the optical sensitivity of which is independent from a temperature, and to achieve a photodetector in which heat applied from heaters is constant even when a plurality of GePDs are provided and in which a temperature and sensitivity of each of the GePDs are the same. The photodetector includes germanium photoreceivers including a silicon substrate, a lower clad layer, a silicon core layer, a silicon waveguide layer, a germanium layer, an upper clad layer, and electrodes. In the photodetector, two or more germanium photoreceivers are arranged adjacent to each other on the silicon substrate, and the photodetector includes resistors embedded in the upper clad layer to cover or surround respective germanium layers of the two or more germanium photoreceivers arranged adjacent to each other, the resistors being made of a metal or a metal compound.
